A vast underwater cathedral of bioluminescent coral transforms into a floating city, its spires reaching toward a surface that never comes. Divers in antique brass helmets float weightlessly between spiraling schools of metallic fish that glow in impossible neon colors. Deep turquoise and luminous coral pink palette, volumetric light rays piercing through crystalline water, ethereal meditative mood, Dali meets Magritte impossible physics, photorealistic 8k rendering